Retaliator Squad 01 was assigned to target the ship repair yard over Sagan III, to deny anchorage to the Red Harbinger battle-barge.

Studying the intelligence readout, the Retributors agree to cripple the station's power and booby-trap the vessel at dry-dock. In this, they disregard the more direct plan put forward by Brother Wolstan's Retaliator Squad 02, their armour stamped with Articles of Just Succession. 01 would then move on to seize the long searched-for silo of Tactical Dreadnought armour.

With the blessing of High Chaplain Hex, their Thunderhawk Gunship assaults the harborage's upper yards. Tracer rounds flash silently in the dark of the void, as surface defence turrets pelt them with fire. Marching across the hull into this hailstorm, the Retaliators slaughter the weakling Karthan NDF, leaving clouds of blood and limbs spinning endlessly in space.

Breaking into the neophyte drill yard, the Retaliators target the trainees. The Astartes recruits are butchered with grenades and psychic explosions, their geneseeds ruthlessly harvested. The disciplined bolter fire of the Fire Hawks Combat Instructors drives them back momentarily, but in close quarters, they are carved into burning husks.
As they approach the supply silo, the frantic effort of chapter serfs finally seals the Retaliators in a blast-chamber with an Ironclad Dreadnaught. It's seismic hammer deals one horrific blow, smashing a Retributor across the chamber. It is then immediately disabled with a psychic power and split in half with a leisurely force-axe blow.

Yet even as the Retaliators celebrate, proximity alarms flare; fleet reinforcements from the Marines Errant Chapter have arrived, approaching at combat speed to defend the supply silo.